#region License
/* Copyright (c) 2011 Maksymilian Mulawa
	
Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice, 
 * this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright notice, 
 * this list of conditions and the following disclaimer in the documentation 
 * and/or other materials provided with the distribution.
   3. The name of the author may not be used to endorse or promote products 
 * derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#endregion

using System.Xml.XPath;
using Weather.com.Client.Exceptions;

namespace Weather.com.Client.WeatherConditions.Common
{
    internal class UnitInfoFactory
    {
        internal UnitInfo Create(XPathNavigator navigator)
        {
            UnitInfo units = new UnitInfo();
            XPathNodeIterator iterator = navigator.Select("/weather/head");
            if (iterator.MoveNext())
            {
                XPathNavigator currentNode = iterator.Current;
                units.Locale = currentNode.SelectSingleNode("locale").Value;
                units.TemperatureUnit = currentNode.SelectSingleNode("ut").Value;
                units.DistanceUnit = currentNode.SelectSingleNode("ud").Value;
                units.SpeedUnit = currentNode.SelectSingleNode("us").Value;
                units.PreasureUnit = currentNode.SelectSingleNode("up").Value;
                units.RainFallUnit = currentNode.SelectSingleNode("ur").Value;
            }
            else
            {
                throw new CouldNotLocateWeatherXmlHeadExcetion();
            }

            return units;
        }
    }
}